The Ehime Maru and USS Greeneville collision was a ship collision between the United States Navy (USN) submarine USS Greeneville (SSN-772) and the Japanese fishery high school training ship Ehime Maru on 9 February 2001, about 9 nautical miles (17 km) off the south coast of Oahu, Hawaii, United States. In a demonstration for some civilian visitors, Greeneville performed an emergency surfacing maneuver. As the submarine surfaced, it struck Ehime Maru, a fishery high school training ship from Ehime Prefecture, Japan. Within minutes of the collision, Ehime Maru sank. Nine of its crewmembers were killed, including four high school students.
Officer of the Watch 